Endpoints & base URLs
Every hosted stack has one canonical data-plane endpoint:
https://<tenant-short-id>--<stack-slug>.db.eu.littlebigbrain.comCopy the complete endpoint_url from the console’s Connect view. Do not
construct it from the stack name alone.
tenant-short-idis the account’s immutable, eight-character lowercase Crockford Base32 identifier, for example0abc1def.stack-slugis the account-scoped stack name, for exampleproduct-dev. Slugs can be reused by different accounts, but not twice in one account.
The examples in these docs use:
https://0abc1def--product-dev.db.eu.littlebigbrain.comWhat the endpoint selects
Section titled “What the endpoint selects”The hostname selects the account and stack. Graph and branch selection uses the
?graph= and ?branch= query parameters, or the corresponding SDK options.
Your stack API key must belong to the account and stack named by the host.
The endpoint stays stable if the stack’s storage placement changes. A stack’s internal storage identity is independent of its public slug, so renaming the slug never moves graph objects.
The composite host is required
Section titled “The composite host is required”Application traffic must use the composite host. A missing or malformed stack
host returns 421 stack_endpoint_required. Presenting a valid credential for
another stack returns 403 stack_endpoint_mismatch. In either case, copy the
console-provided endpoint_url.
TLS and health
Section titled “TLS and health”Every stack endpoint is HTTPS-only and covered by the cell wildcard
certificate. Operational health checks use the exact hostname
https://health.db.eu.littlebigbrain.com/healthz, which reports cell health
only. Application traffic goes to the stack endpoint.
Hosted MCP addressing
Section titled “Hosted MCP addressing”Hosted MCP uses a path form:
https://mcp.littlebigbrain.com/mcp/<stack-slug>The slug is resolved within the WorkOS organization established by OAuth, so two organizations can use the same slug without colliding.
Base URL summary
Section titled “Base URL summary”| Purpose | URL |
|---|---|
| Hosted stack | https://<tenant-short-id>--<stack-slug>.db.eu.littlebigbrain.com |
| Hosted MCP | https://mcp.littlebigbrain.com/mcp/<stack-slug> |
| SaaS API | https://api.littlebigbrain.com |
| Console | https://cloud.littlebigbrain.com |
| Cell health | https://health.db.eu.littlebigbrain.com/healthz |
Next: run the Quickstart or review Authentication & endpoints.